Microsoft has confirmed that there is no backdoor in Windows 7. The official denial was prompted by Richard Scheffer of National Security Agency’s recent testimony.
“The key problem is that NSA has a dual mission, COMPUSEC, computer security, now called cyber security, and SIGINT, signals intelligence, in other words surveillance,” said Marc Rotenberg of Electronics Privacy Information Center (EPIC).
“The key point is that the NSA is not the right agency to promote computer security in the private sector,” Rotenberg added.
Source: TG DAILY

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This heading made me lol.
I believe there is some sort of back door. Not sure what it would be or how it is accessed, but since the US government uses windows, it just makes sense. I have no proof.
No backdoor found that not mean safe from hacker, still have other point that hacker try to hacking.